I have a 20000mAh power bank in my home, but I think it is too heavy and quite big for me when I use small bag during the summer. Thus I bought this one, this power bank is much lighter than my 20000mAh one; but still good enough for a short business trip. I can use it to charge my iPhone X for 4-5 times. I love this power bank also because of the digital number, far better than the light dots.